Transformer.



.W. S. MOODY.

TRANSFORMER. APPLICATION FILED MAR.2, 1910.

1, 57, 77, Patented May. 25,1913} Witnesses: [nventor':-..-

g g 5 Walter amo dg,

UNITED STATES PATENT OFFICE.

WALTER S. MOODY, OF PITTS FIELD, MASSACHUSETTS, ASSIGNOR T0 GENERAL ELECTRIC COMIANY, A CORPORATION OF NEW YORK.

TRANSFORMER.

T 0 all whom it may concern: I

Be it known that -I, WVALTER S. MOODY, a citizen of the United States, residing at Pittsfield, in the county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Transformers, of which the following is a specification.

My invention'relates to electric transformers, and has for its object an improve ment in the connections of such devices.

More specifically my invention relates to electric transformers which are provided wit-hintermediate taps upon one or both of the windings in order to operate the transformer through a range of different voltages.

I am aware that it is customary to operate transformers with taps brought out intermediate the extremities of either or both windings, and connect the incoming or outgoing circuits across the entire winding or only aportion thereof by the use of the taps of the winding. Such connections are used to obtain a desired regulation or change of voltage. While such an arrangement is perfectly satisfactory if great changes in voltage are not desired, i it he wished, for example, to operate a transformer with its primary connected to a supply circuit of constant potential and to have the voltage of its secondary vary through a wide range, it may occur that. the portion of the primary winding which is not connected to the supply circuit may be much greater than the portion which is so connected, and thus an exceedingly high voltage will be induced across the primary winding.

The object of my invention is to prevent the occurrence of this voltage in a transfUI'lllCI SHCll as l have des ribed. and I no cmnplish this olijccl by dividing one or both 4 of the windings into disconnected portions or groups of sections formed by the taps couuccted to the winding, and connecting (hcsc whi h there will l)( a voltage of such liujilcd amount a may be desirable.

the insulation of the transformer.

Specification of Letters Patent. Patented Ian 25 1913 Application filed March 2,1910. Serial No. 546,946. 7

i For a further, understanding of .my invention reference may be had to the accompanying drawing, where- Figure 1 shows diagrammatically a transformer having a number of taps and not provided with my invention; Fig. 2 shows a transformer provided with my invention; and Fig. 3 shows a modification of Fig. 2.

Referring first to Fig. .1,-. 1;,is-the winding of a transformer connected to conductors 2 and 3, whichmay be supply. conductors, and having taps 4, 4, 4 etc. 1 is the second winding of the transformer that may be connected to suitable translating devices. If it be desired to .change the ratio of transformation, conductor 2 may be connected to taps 4 4, etc, in the usual manner. It will be obvious that, if the portion of the winding tap 4 and conductor 3 is only a fraction of the entire winding, the voltage induced between tap .4 and end connection 4 will be much higher than the impressed voltage between conductors 3 and 3 when conductor 2 is connected to tap 4, and this may be a source of considerable danger to In order to avoid this danger, I break up the winding into disconnected groups of several sections, as shown in Fig. 2. i

In F lg. 2 I have shown a switching device 5 consisting of movable contactanenibers 5", and stationary contact members 5 connected to the taps and conductor 2, which switching' device, for the purpose of cle'arness of illustration, is shown diagrammatically, but it is obvious that any of the well known and usual devices may be used. If the switching device he moved in the i'life ction of the arrow, it will be seen that forg tihei'first posiiion of the device, a s shown by dotted line conductor 2 isconnected across the entire winding 1 of the transformer and the disconnected groupspf sections are connected together in series. Subsequent positions of the switching device are denoted by the subsequent dotted lines, conductor 2 being conncclcd lo the various taps for these positions. .\flcr conductor 2 has been connected to tap l", the ncxl movement of the switch discern uccis the group of sections between taps 4. "1. 1- and '1" from lhereniainder of the windin; and connects conductor 2 to tap 4. It will thus bc obvious that the winding is lirokcu up into a number of groups or portions, across each of which the induced voltage may be kept to a desirable limit by a suitable design of the transformer.

In Fig. 3 I have shown the same arran ement as shown in Fig. 2, the switching device not being shown. The winding of the transformer not provided with taps being provided with a switch 7, and suitable connections for series or parallel connection.

rangement, but seek in the appended claims to cover all arrangements which are obvious to those skilled in the art and do not depart from the spirit of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is 1. The combination with a transformer having a winding divided into groups, of a switching means arranged in one of its positions to connect said groups to the mains and in series with each other, and in another of its positions to connecta smaller number of said groups to said mains and to disconnect the other group or groups from the remainder of the winding.

2. The combination with a transformer having a winding divided into groups, of a switching means assanged in one of its positions to connect said groups to the mains and in series with each other, and in another of its positions to connect a smaller number of said groups to said mains and to disconnect the other groups from each other and the remainder of the winding.

In Witness whereof, I have hereunto setmy hand this 21st day of February, 1910.

WALTER S. MOODY.

\Vitnesses I CHAS. R. BLAKELY, JAB. A. ONEXLL.

age may be kept to a desirable limitby a suitable design of the transformer.

In Fig. 3 I have shown the same arran ement as shown in Fig. 2, the switching evice not being shown. The winding of the transformer not provided with taps being provided with a switch '7, and suitable connections for series or parallel connection.

rangement, but seek in the appended claims to cover all arrangements which are obvious from the spirit of my invention.

to those skilled in the art and do not depart What I claim as new and desire to secure by Letters Patent of the United States, is-- 1. The combination with a transformer an improvement in Transrorrners,

Patent Oflice.

[SEAL orrection in Letters Patent No. 1,057,077.

1913, upon the application pf \Valter S. Moody, of Pittsfield, Massachusetts correction therein, that the same may having a winding divided into groups, of a 2 switching means arranged in one of its positions to connect said groups to the mains and in series with each other, and in another of its positions to connect a smaller number of said groups to said mains and to disconnect the other group or groups from the remainder of the winding.

2. The combination with a transformer having 'a- Winding divided into groups, of

a switching means armnged in one of its positions to connect said groups to the mains and in series with each other, and in another of its positions to connect a smaller number of said groups to said mains and to disconnect the other groups from each other and the remainder of the winding.

In witness whereof, I have hereunto set my hand this 21st day of February, 1910.

XVALTER S. MOODY.

"Witnesses CHAS. R. B AKELY, Jae. A. ONEILL.

It is hereby. certified that in Letters Patent No. 1,057,077, granted March 25,

for

an error appears in the printed specification requiring correction as'follows: Page 1, line 78, first occurrence,

'for thereferencevnumeral f3 read :9; and that the said Letters Patent should be read with this conform to the record of the case in the Signed and sealed this 6th day of May, A. D., 1918.

o. o. BILLINGS, Acting Commissioner of Patents.

It is hereby certified that in Letters Patent No. 1,057,077, granted March 25,

I l 1913, upon the application of Walter S. Moody, of Pittsfield, Massachusetts, for an irnprovement in Transrormers, an error appears in the printed specification requiring correction as follows: Page 1, line 78, first occurrence, for the referencenumeral f3 read :2; and thet the said Letters Patent should be read with this correction therein, that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of May, A. 1)., 1913.

[SEAL] C. C. BILLINGS,

Acting Commissioner of Patents.

orrection in Letters Patent No. I, 

